问题 解答题
8
13
÷7+
1
7
×
6
13
1
6
×
2
3
÷(
4
5
-
8
15
[
1
2
-(
3
4
-
3
5
)]÷
7
10
3-
3
14
×2-
4
7
答案

(1)

8
13
÷7+
1
7
×
6
13

=

8
13
×
1
7
+
1
7
×
6
13

=(

8
13
+
6
13
)×
1
7

=

14
13
×
1
7

=

2
13

(2)

1
6
×
2
3
÷(
4
5
-
8
15
),

=

1
6
×
2
3
÷
4
15

=

1
9
×
15
4

=

5
12

(3)[

1
2
-(
3
4
-
3
5
)]÷
7
10

=[

1
2
-
3
20
7
10

=

7
20
÷
7
10

=

1
2

(4)3-

3
14
×2-
4
7

=3-

3
7
-
4
7

=3-(

3
7
+
4
7
),

=3-1,

=2.

单项选择题
单项选择题